[site/nav][s]: change nav contents.

- Rename "Notes" as "Index"
- Hide "Claims" from the Nav (as now in Guide)

site/config/navLinks.js

@@ -1,9 +1,8 @@
 const navLinks = [
   { href: '/about', name: 'About' },
   { href: '/guide', name: 'Guide' },
-  { href: '/claims', name: 'Claims' },
   { href: '/library', name: 'Library' },
-  { href: '/all', name: 'Notes' },
+  { href: '/all', name: 'Index' },
   { href: '/contribute', name: 'Contribute' },
 ]